Blinken In Riyadh To Press Ceasefire, Hostage Talks; Pro-Palestinian Protests Shake U.S. College Campus; Sanders Supports Pro-Palestinian Protests, Condemns Bigotry. Dam Bursts in Southern Kenya; South African Teacher Assesses Dire State of Education; Elon Musk Meets Chinese Premier Li Qiang, Trade Officials; Record Low Sea Ice Threatens Emperor Penguin Population.